He snuck into L.A. Fitness Center in Bridgeville, near Pittsburg, and shot up an entire room full of exercisers. Patrons were taking a Latin dance class, and had no clue a murderer was lurking in their midst before the shooting started.
The gunman apparently wounded the instructor along with at least nine other participants. Then, he reportedly killed himself. There has been no identification of either the gunman or the victims at this point.